[Python APIView] Literal values are not quoted in type annotations

**Bad code snippet:**
```python
file_mode: Optional[str] = ...
```

**Description:**
The APIView parser is incorrectly rendering type annotations for parameters that should use `Literal` values. String literal values are not quoted, making it unclear that they are string literals for type checking purposes.

**Expected behavior:**
Literal values should be quoted to clearly indicate string literals in type annotations.

**Good code snippet:**
```python
file_mode: Optional[Literal['New', 'Restore']] = ...
```

Start with the APIView parser and its handling of Python type annotations, using the bad and good snippets as the reproduction. Trace how Literal values are rendered and add or update coverage for quoted string values. Done means the output matches the expected Literal['New', 'Restore'] form.

Written by the indexing model from the issue text.